This FOSA 340S2, 340S8 Replacement Battery is 100% compatable with the BP340S1 FOSA 340S2, 340S8 Replacement Battery. Our batteries and accessories are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All batteries are tested for 100% quality control assurance. This FOSA 340S2, 340S8 Replacement Battery includes a warranty to guarantee that it has no manufacturing defects.